CS6501/ECE6501 IoT Sensors and Systems September 11, 2017 Brad Campbell – bradjc@virginia.edu http://www.cs.virginia.edu/~bjc8c/class/cs6501-f17/

SeaGlass: Enabling City-Wide IMSI-Catcher Detection Peter Ney, Ian Smith, Gabriel Cadamuro, and Tadayoshi Kohno Privacy Enhancing Technologies 2017

Why? To try to detect IMSI-catchers Generate a data set that is currently hidden from the public

Hypotheses “We argue that the community—and those engaged in the policy debate surrounding cell-site simulator usage—would benefit from additional, independent sources of information on cell-site simulators.” A crowd-sourced scan of normal 2G basestations will have predictable and stable characteristics, and anomalies in signal strength, duration, consistency, and settings can be detected and will identify IMSI-catchers.

How?

Challenges? Why is this hard? What would you have done differently?

Did they find one?

Other thoughts Is 2G enough? What about Verizon? Can you pay an Uber driver (with the sensor) to go to a spot to get more measurements? Is four weeks enough?

Writing good captions

Captions (and figures) are important Very few people will read a document in its entirety. Easiest way to quickly “read” a paper is to look at the figures. Putting key information in captions will get it to more readers.

Good captions do three things. Identify what the figure is. Explain what the figure is showing. Tell you what the takeaway is. This is the hard one!

This is a bad caption

This is better

This is a good caption

Thoughts?

Thoughts?

Thoughts?

Thoughts?